From 0f598f20d1c618933ffd1a02207912915fcd454e Mon Sep 17 00:00:00 2001
From: gameblabla <gameblabla@openmailbox.org>
Date: Sun, 21 Jul 2019 07:43:56 +0200
Subject: [PATCH] psxbios: Add checks for memchr.

---
 libpcsxcore/psxbios.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 7b2c05fc..3247402d 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -924,6 +924,12 @@ void psxBios_memcmp() { // 0x2d
 
 void psxBios_memchr() { // 0x2e
 	char *p = (char *)Ra0;
+	
+	if (a0 == 0 || a2 > 0x7FFFFFFF)
+	{
+		pc0 = ra;
+		return;
+	}
 
 	while ((s32)a2-- > 0) {
 		if (*p++ != (s8)a1) continue;
-- 
2.39.2